I made both of these sights in the '80's for my 1897 RB

The base on the German type sight makes it correct to mount on the tang, using a 17A front sight.

The 1902 Springfield is mounted on a piece of 1/2 round stock, cut to match the bottom of the sight s, it can be mounted on a octagon flat and the spacing was for a Weaver mount, of some type that I was using. Can't remember what the mount was for. It could be shortened and re-drilled for something else. I made it to shoot a BP class in that time period.

$150 for the German sight and $100 for the 1902 plus shipping.